<p>It is highly suspicious when a value is saved for a key or index and then unconditionally overwritten. Such replacements are likely errors.</p>
<h2>Noncompliant Code Example</h2>
<pre>
letters.put("a", "Apple");
letters.put("a", "Boy");  // Noncompliant

towns[i] = "London";
towns[i] = "Chicago";  // Noncompliant
</pre>

